Hi, I am Vikram. Architect from India. This is my first mail to this forum.
I am developing a very large site in sketchup. I have both contour lines and elevation points. I am using elevation points as Contour lines are not so clear. The problem is when i am using "from scratch" sandbox tool, some vertices are not highlighting to add elevation points. I have totally 4000+ points of which after adding a horizontal row of 15-20 points (each at 5 meters distance) few points are not highlighting to add elevation points.

plz help me.

thanku